Dell 4350 Server User Manual


 
16 Dell PowerEdge 4350 Systems Users Guide
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Abbreviation for Virtual Direct Memory
Access Services.
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Acronym for Video Electronics Standards
Association.
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Abbreviation for video graphics array. VGA
and SVGA are video standards for video
adapters with greater resolution and color
display capabilities than EGA and CGA,
the previous standards.
To display a program at a specific resolu-
tion, you must install the appropriate
video drivers and your monitor must sup-
port the resolution. Similarly, the number
of colors that a program can display de-
pends on the capabilities of the monitor,
the video driver, and the amount of mem-
ory installed for the video adapter.
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On some systems with a built-in VGA
video adapter, a VGA feature connector
allows you to add an enhancement adapt-
er, such as a video accelerator, to your
computer. A VGA feature connector can
also be called a
VGA pass-through
connector
.
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The logical circuitry that providesin
combination with the monitor or display
your computers video capabilities. A
video adapter may support more or fewer
features than a specific monitor offers.
Typically, a video adapter comes with
video drivers for displaying popular
application programs and operating envi-
ronments in a variety of video modes.
On most current Dell computers, a video
adapter is integrated into the system
board. Also available are many video
adapter cards that plug into an expansion-
card connector.
Video adapters can include memory sep-
arate from RAM on the system board. The
amount of video memory, along with the
adapters video drivers, may affect the
number of colors that can be
simultaneously displayed. Video adapters
can also include their own coprocessor
chip for faster graphics rendering.
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Graphics-mode application programs and
operating environments, such as Win-
dows, often require video drivers in order
to display at a chosen resolution with the
desired number of colors. A program may
include some generic video drivers.
Any additional video drivers may need to
match the video adapter; you can find
these drivers on a separate diskette with
your computer or video adapter.
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Most VGA and SVGA video adapters in-
clude VRAM or DRAM memory chips in
addition to your computers RAM. The
amount of video memory installed prima-
rily influences the number of colors that a
program can display (with the appropriate
video drivers and monitor capability).
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Video adapters normally support multiple
text and graphics display modes. Charac-
ter-based software (such as MS-DOS)
displays in text modes that can be defined
as
x
columns by
y
rows of characters.
Graphics-based software (such as Win-
dows) displays in graphics modes that can
be defined as
x
horizontal by
y
vertical pixels
by
z
colors.
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Video resolution640 x 480, for exam-
pleis expressed as the number of pixels
across by the number of pixels up and
down. To display a program at a specific
graphics resolution, you must install the
appropriate video drivers and your moni-
tor must support the resolution.
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An operating mode supported by Intel386
or higher microprocessors, virtual 8086
mode allows operating environments
such as Windowsto run multiple pro-
grams in separate 1-MB sections of
memory. Each 1-MB section is called a
virtual machine
.
3502Ebk0.book Page 16 Friday, November 13, 1998 10:00 AM